Anti-counterfeiting Display with Composite Uneven Structure
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Solution Overview
Problem
Existing anti-counterfeiting displays lack effectiveness as their techniques have become widely known, necessitating a more advanced solution to prevent counterfeiting in valuable documents and products.
Innovation Solution
A display featuring an uneven-structure-forming layer with a specific arrangement of concavities and convexities, combined with a reflecting layer, which produces iridescent changes and high-chroma structural colors when viewed from different angles, enhancing anti-counterfeiting features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a diffraction grating is used to produce iridescent color change, then the anti-counterfeiting effect is improved, but the technique becomes widely known and easier to counterfeit
Solution Approach 1:
The invention combines a diffraction grating layer with a fine uneven structure layer (having concavities and convexities) to create a composite display structure. The diffraction grating provides iridescent color change with observation angle, while the fine uneven structure provides structural color with high chroma. This composite approach creates a more complex optical effect that is harder to counterfeit while maintaining the visual security features.
Solution Approach 2:
The invention introduces a specific layer structure where the fine uneven structure layer is positioned between the diffraction grating layer and the substrate. This local structural differentiation creates specific optical paths and interference patterns that are difficult to replicate, adding a layer of complexity to counterfeiting while preserving the overall security display function.
2Stability of the object's composition
If a fine uneven structure is used to display high chroma color, then the color stability is improved, but the iridescent color change effect is reduced
Solution Approach 1:
The invention merges two different optical mechanisms into a single display structure: the diffraction grating layer provides iridescent color change with observation angle, while the fine uneven structure layer provides stable structural color with high chroma. By combining these two layers in a specific configuration, the display achieves both color stability and iridescent color change effects simultaneously.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The display achieves better anti-counterfeiting effects by providing unique visual effects that are difficult to replicate, making it harder to counterfeit valuable items such as currency, IDs, and brand products.
Implementation Method 1
a display that scatters illumination light and displays a color with high chroma by virtue of a fine uneven structure
Implementation Method 2
a display provided with a diffraction grating. Depending on the observation angle, the wavelength of diffracted light reaching the observer's eyes varies. With this variation, the observer recognizes iridescent change in a display color
Data Source
Figure 1A~1B
Figure 1C~2
Figure 3
AI summary
The present invention aims to provide a display that exhibits better anti-counterfeiting effects and an article with the display. The display of the present invention includes an uneven-structure-forming layer having an uneven structure on one surface and a reflecting layer that covers at least part of an unevenly structured surface of the uneven-structure-forming layer. In the display, the uneven-structure-forming layer includes a first region group including a plurality of first regions, each first region including a flat part and a plurality of convexities or a plurality of concavities, the top surface of each of the convexities or the bottom surface of each of the concavities is substantially parallel to a surface of the flat part; distances between the centers of adjacent convexities or concavities are not equal; the convexities have a uniform height, or the concavities have a uniform depth; the first region group is formed, with the first regions arrayed inside at a regular pitch.